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Top Forums Shell Programming and Scripting Shell Script [Replacing string] Post 302551203 by jzhang172 on Monday 29th of August 2011 05:09:39 PM
Old 08-29-2011
Shell Script [Replacing string]

My friend and I are working on a project together and we are trying to create a shell script that renames, replaces a string in a text file. The newly created file with the substitution would replace the name of the original file. And the original file would be saved as "____.txt.bak"

This is the code we came up with:
PHP Code:
#!/bin/sh

if [ -"$3" ] ; then
mv 
"$3" "$3.bak"
sed "s/$1/$2/g" "$3.bak" "$3"
else
echo $
3 not found
exit 1
fi 
To test it, we created a file called happy.txt and in that file, there are only four words: happy happy cow happy


we did: ~/test/subst1 cow happy happy.txt


We thought that this would replace cow with happy, but it didn't work, we got this in return as a message:
PHP Code:
~/test/subst1testargument expected 




Any help would be appreciated...
 

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ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME
atf-sh [-s shell] -- interpreter for shell-based test programs SYNOPSIS
atf-sh script DESCRIPTION
atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library. atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL. atf-sh executes the inter- preter, loads the atf-sh(3) library and then runs the script. You must consider atf-sh to be a POSIX shell by default and thus should not use any non-standard extensions. The following options are available: -s shell Specifies the shell to use instead of the value provided by ATF_SHELL. ENVIRONMENT
ATF_LIBEXECDIR Overrides the builtin directory where atf-sh is located. Should not be overridden other than for testing purposes. ATF_PKGDATADIR Overrides the builtin directory where libatf-sh.subr is located. Should not be overridden other than for testing purposes. ATF_SHELL Path to the system shell to be used in the generated scripts. Scripts must not rely on this variable being set to select a specific interpreter. EXAMPLES
Scripts using atf-sh(3) should start with: #! /usr/bin/env atf-sh Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh. Instead, you have to hardcode the path to atf-sh in the script and then use the -s option afterwards as a single parameter: #! /path/to/bin/atf-sh -s/bin/bash ENVIRONMENT
ATF_SHELL Path to the system shell to be used in the generated scripts. SEE ALSO
atf-sh(3) BSD
September 27, 2014 BSD
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